Light Guide Panel Frustum Structure for Luminance and Transparency
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Solution Overview
Problem
Current light guide panels struggle to achieve high luminance and transparency simultaneously when overlaid on display screens, as existing technologies either compromise on luminance or transparency due to the scattering of extraneous light by the concave-convex structure, making it difficult to view both the design and the underlying display image effectively.
Innovation Solution
A light guide panel with a concave-convex structure featuring frustum shapes, where the fill ratio is 15% or greater, and a light transmittance of 50% or greater, allowing for high luminance when the panel is on and high transparency when it is off, by densely distributing tapered faces for efficient light emission and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a concave-convex structure is formed on the light guide panel to enable light emission, then emitted luminance is improved, but transparency deteriorates due to scattering of extraneous light
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions: the light emission region has a concave-convex structure with high reflectivity for internally propagated light, while the non-light-emission region maintains a flat surface with high transparency. This spatial differentiation allows the panel to simultaneously achieve high emitted luminance in the design region and high transparency in other regions, resolving the contradiction between these two properties.
2Productivity
If the fill ratio of the concave-convex structure is increased to improve light extraction efficiency, then emitted luminance is improved, but transparency deteriorates
Solution Approach 1:
The patent implements local quality by concentrating the concave-convex structure (with high fill ratio and thus high light extraction efficiency) specifically in the light emission region, while keeping the non-light-emission region flat. This localized approach allows the system to achieve high light extraction efficiency where needed without compromising transparency across the entire panel, as the flat regions transmit extraneous light effectively.
3Illumination intensity
If the light guide panel is designed to emit light at high luminance, then the design visibility is improved, but the transparency for viewing the underlying display image deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the surface structure between the light emission region and the non-light-emission region. The light emission region features a concave-convex structure that enhances emitted luminance for design visibility, while the non-light-emission region maintains a flat surface that preserves transparency for viewing the underlying display image. This spatial separation of functions allows both high emitted luminance and high transparency to coexist in different areas of the same panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances both emitted luminance and transparency, enabling clear visibility of the design when the panel is on and the underlying display image when it is off, by optimizing the concave-convex structure's design to balance light emission and transmission.
Implementation Method 1
Light incident inside the light guide panel, or in other words, internally propagated light, propagates inside the light guide panel while reflecting off the surface of the light guide panel
Implementation Method 2
an optical body combining the waveguide phenomenon of light and a phenomenon of scattering light with a concave-convex structure
Implementation Method 3
Light incident inside the light guide panel, or in other words, internally propagated light, propagates inside the light guide panel while reflecting off the surface of the light guide panel
Data Source
AI summary
There is provided a novel and improved optical body, method for manufacturing an optical body, light-emitting apparatus, and display apparatus for amusement equipment capable of improving emitted luminance and transparency, the optical body including: a base material; and a light extraction section, formed on at least one surface of the base material, that extracts internally propagated light incident inside the base material from a side face of the base material to an outside of the base material. The light extraction section includes a concave-convex structure in which at least one of concavities and convexities has a frustum shape, a fill ratio of the concave-convex structure is 15% or greater, and a light transmittance is 50% or greater.